Publishing an ebook brings some mixed emotions. Trying to publish a print book means selling yourself and the book to an agent and a publisher and if you don’t get through that then your book is dead before anyone reads it.
Publishing the ebook gets it out in front of a large audience quickly but then what is a success? If ten people buy it and like it, is that a success? How about one hundred? One thousand?
Certainly in print publishing a thousand sales would be a failure. With an ebook, getting one sale to a stranger and getting a good review could be considered a success. Someone liked what you had created. Financially a few thousand sales can be rewarding while that would still be a failure in print publishing.
To make a living publishing ebooks would require publishing many books and selling tens of thousands of every one. I think my measure of success does not include making a living as a writer. That would be very nice though.